Examine source code of Dutycast

{
  "name": "__MSG_extName__",
  "manifest_version": 2,
  "default_locale": "en",
  "version": "1.37.0",
  "description": "__MSG_appDesc__",
  "background": {
    "scripts": [
      "static/js/service-worker.bundle.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "static/js/jquery-3.3.1.min.js",
        "static/js/content.bundle.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.dutycast.com/*"
      ],
      "js": [
        "static/js/jquery-3.3.1.min.js",
        "static/js/checkout.bundle.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.dutycast.xyz/*",
        "*://*.dutycast.com/*"
      ],
      "js": [
        "static/js/checkout-start-load.bundle.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_title": "Your Shopping Assistant",
    "default_popup": "popup.html",
    "default_icon": "static/assets/icon.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "cookies",
    "proxy",
    "nativeMessaging",
    "http://*/*",
    "https://*/*"
  ],
  "icons": {
    "128": "static/assets/icon.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "web_accessible_resources": [
    "static/assets/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@dutycast.com",
      "strict_min_version": "91.1.0"
    }
  }
}